using System;

class Program
{
    static void Main()
    {
        string s = Console.ReadLine();

        for (int i = 0; i < s.Length; i++)
        {
            Console.Write((char)((((s[i] - (i + 1) % 26)) - 13) % 26 + 65));
        }

        Console.WriteLine();
    }
}